Hi, just purchased this 95 blazer, been reading as many post as I can to learn, so heres the deal. 4.3 running like crap sounds like 4 or 5 cyl at idle very rough. did a full tuneup this past weekend. still running rough. Cleaned egr valve (after reading post) piece of soot holding pin open, idles a little better but not much. first thing in the am it will fire right up on its own, afternoon or when warm hold foot to the floor to start like its flooding out. getting a little soot out tail pipe when rough idle exist. if you pin it seems to clear out a little. Yes check engine light is on will try to get scanned soon. like I said just purchased last week for cheap so slowly tracking down problems. thx for the info.